Passage at Delphi (The Apollo Series)

A terrorist attack in modern-day Greece causes Apollo, the god of prophecy, to foresee the collapse of Western civilization. He handpicks a husband-and-wife team, college professors Lauren and Zack Fletcher, to travel back in time into the front lines of the war between Greece and Persia. There, they learn the hard lessons of history, so they can help him change the course of events in the future – only they don’t know his grand plan. Through it all, they struggle to stay alive and keep their marriage afloat in this non-stop historical adventure thriller, the first of six books in The Apollo Series.